Russia is rumored to be behind the attack, with some believing it’s retribution for the nation getting banned from the Olympics over its Kremlin-backed doping ring.

Yet Russia claimed in the days leading up to the opening ceremony that it wasn’t planning a cyber attack.

“We know that Western media are planning pseudo-investigations on the theme of ‘Russian fingerprints’ in hacking attacks on information resources related to the hosting of the Winter Olympic Games in the Republic of Korea,” the nation’s foreign ministry warned.

“Of course, no evidence will be presented to the world.”

The strong statement came after cyber security experts warned the Kremlin could be mounting a retaliatory attack for more than 200 athletes getting banned.

International Olympic Committee spokesman Mark Adams indicated the body wasn’t aware of who was behind the attack.

“I certainly don’t know,” he said of a possible culprit. “But best international practice says that you don’t talk about an attack.

“It is one we are dealing with. We are making sure our systems are secure and they are secure.”